fix duplicate symbol

android/src/main/kotlin/com/jarvan/fluwx/constant/WeChatPluginMethods.java

@@ -19,7 +19,7 @@ public class WeChatPluginMethods {
     public static final String SHARE_WEB_PAGE = "shareWebPage";
     public static final String SHARE_MINI_PROGRAM = "shareMiniProgram";
 
-    public static final String PAY = "pay";
+    public static final String PAY = "payWithFluwx";
     public static final String WE_CHAT_PAY_RESPONSE = "onPayResponse";
 
 }

ios/Classes/FluwxPlugin.m

@@ -77,7 +77,7 @@ FluwxPaymentHandler *_fluwxPaymentHandler;
         return;
     }
 
-    if([@"pay" isEqualToString :call.method]){
+    if([@"payWithFluwx" isEqualToString :call.method]){
         [_fluwxPaymentHandler handlePayment:call result:result];
         return;
     }

lib/src/fluwx_class.dart

@@ -136,7 +136,7 @@ Future pay({@required String appId,
   @required String sign,
   String signType,
   String extData}) async {
-  return await _channel.invokeMethod("pay",{
+  return await _channel.invokeMethod("payWithFluwx",{
     "appId": appId,
     "partnerId": partnerId,
     "prepayId": prepayId,